This article covers DS218+ [DiskStation 2ベイ NAS デュアルコアCeleron J3355 2GBメモリ SATA対応].

Overview

The Synology DS218+ is a 2-bay network-attached storage (NAS) designed for home users and small offices. Powered by an Intel Celeron J3355 dual-core processor (2.0GHz base, 2.5GHz burst) and 2GB of DDR3L RAM (expandable to 6GB), it delivers solid performance for file sharing, media serving, and backup tasks. Its compact chassis houses two SATA 6Gbps drive bays, supporting up to 32TB total capacity (16TB × 2). The unit runs Synology's DiskStation Manager (DSM), a mature and user-friendly operating system with a rich ecosystem of first-party and third-party applications.

Connectivity & Compatibility

Network: single Gigabit Ethernet (RJ-45) port. USB 3.0 × 2, eSATA × 1 for external drives or UPS. No 2.5GbE or 10GbE support. Drive support: 3.5-inch SATA HDD/SSD (2.5-inch via optional tray). Hot-swap capable. RAID modes: Basic, JBOD, RAID 0, RAID 1. RAID 1 mirrors data across both drives for protection against single-drive failure. Client OS: Windows, macOS, Linux, Android, iOS. File protocols: SMB, AFP, NFS, FTP, WebDAV, and more.

Product Info

Released in late 2017, the DS218+ remains widely available new on and other retailers. Pricing typically ranges from ¥38,000 to ¥45,000 depending on the seller. The standard warranty is 2 years. Included in the box: the NAS unit, power adapter, RJ-45 LAN cable, quick installation guide, and drive screws. Market positioning: entry-to-mid-range. It offers a balanced mix of affordability and essential NAS features, but lacks 4K transcoding and multi-gigabit networking found in higher-end models like the DS920+. For users who need basic file sharing, backup, and media streaming without breaking the bank, it's a strong choice.

Best Use Cases

Home backup hub: Automatically back up photos from smartphones and documents from PCs. DSM's Hyper Backup and Synology Photos make setup straightforward. Small office file server: Share project files among a small team. RAID 1 ensures data survives a single drive failure. Plex/DLNA media server: Stream movies and music to smart TVs and game consoles. Note: 4K transcoding is not supported, so direct-play compatibility is required for 4K content. Budget-conscious reliability seekers: If you want a stable, well-supported NAS without spending on premium features you won't use, the DS218+ delivers excellent value.

Things to Consider

The stock 2GB RAM is adequate for basic use, but running multiple Docker containers or heavy applications may benefit from upgrading to 6GB (add a 4GB DDR3L-1866 SODIMM). No 4K hardware transcoding. If you plan to stream 4K video remotely, consider a higher-tier model like the DS920+ or DS1522+. Single Gigabit Ethernet limits aggregate throughput to ~110 MB/s. For faster transfers, a 2.5GbE-capable NAS and network upgrade would be needed. The single 92mm fan is quiet (19.5 dB idle, 22.5 dB under load) but not silent. Avoid placing it in a bedroom if noise sensitivity is a concern. ## FAQ
Q: Do I need to buy drives separately? A: Yes. The DS218+ is sold as a barebone unit. You'll need to purchase two 3.5-inch SATA HDDs or SSDs separately. Q: Can I back up to an external USB drive? A: Absolutely. Connect a USB 3.0 external drive and use DSM's Hyper Backup to schedule backups of your internal volumes. Q: Is remote access difficult to set up? A: Not at all. Synology's QuickConnect service lets you access your NAS from anywhere without manual port forwarding. The DS file mobile app makes browsing and uploading files easy.

Product Disclosure (Amazon)

  • Manufacturer: Synology
  • Seller: New Oriental Technology
  • Fulfilled by: New Oriental Technology
  • ASIN: B075L82DP1
  • Note: This article covers a manufacturer-made product based on Amazon listing details.